Going lean when I crack the throttle
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From: Cecil County, MD
Going lean when I crack the throttle What should I change with LS1 edit to add some fuel when I crack the throttle? I can watch my wideband guage go down to 17to1 then go back to normal when I just crack into it to rev it up. I'm also getting knock when first get into it. doesn't seem to matter what rpm im at.
I did change the throttle cracker under idle/limiters to 0.00 for <2200 and <48mph. would that cause it or is the throttle cracker something else?
Thanks
Frank
I did change the throttle cracker under idle/limiters to 0.00 for <2200 and <48mph. would that cause it or is the throttle cracker something else?
Thanks
Frank
I believe this indicates that the low end of your VE
table is too lean. Every time MAP changes you fall
into a pure speed density airflow more until the MAF
is "thought" to have caught up. If you can catch the
MAP & RPM at which you see this, and fatten the
VE table at and about those points (perhaps with
some eyeball extrapolating) this and tip-in ping will
go away.
You don't probably want to fatten up the idle area,
with that cam. Thing is your setup probably has made
some wild changes to true VE relative to stock and
you have to wade through it. There're how-tos about
doing the speed density tuning, but I just went at it
shade tree style until I got things nice and quiet (at
the time, no such guides). If you have the wideband
logging with the EIO then a bit of open loop driving
with MAP, RPM, commanded and actual AFR can give
you a good map of what needs changed, pretty clean.
closed
table is too lean. Every time MAP changes you fall
into a pure speed density airflow more until the MAF
is "thought" to have caught up. If you can catch the
MAP & RPM at which you see this, and fatten the
VE table at and about those points (perhaps with
some eyeball extrapolating) this and tip-in ping will
go away.
You don't probably want to fatten up the idle area,
with that cam. Thing is your setup probably has made
some wild changes to true VE relative to stock and
you have to wade through it. There're how-tos about
doing the speed density tuning, but I just went at it
shade tree style until I got things nice and quiet (at
the time, no such guides). If you have the wideband
logging with the EIO then a bit of open loop driving
with MAP, RPM, commanded and actual AFR can give
you a good map of what needs changed, pretty clean.
closed
